The INDEX. 



tut, ib. Virgin, what, 

 288. Effecls of the air in 

 the produclion of, 292 feq. 

 Effecls of the fire in the 

 fame, 294. Whether ar- 

 fenical, 326. How in the 

 pyrites, 306. Boiling for, 



339 fec iq- 

 Vitriolic refidue, phenomena 



of, 322 feq. 



Vitriolifation of the pyrites, 



formal reafon of, 98, 294. 



The air neceffary in, 296. 



What hinders or promotes 



it, 298, 308 



Vitriol-pyrites, what, 19, 



20 



Volatilifation of imperfeft 



metals, 141 



Volcanoes, whence, 90 

 U. 



T ]Nmetallic earth in pyri- 

 ^ tes, 1 27 feq. What it is, 

 127. How produced, 128. 

 Difcovered in other ores, 

 129. How exhibited in 

 the pyrites, 130, feqq. 

 Nature 



of, not eafy to be determin- 

 ed, 131. 



W. 



V\/rEathering, what, 305. 

 vv White-pyrites, what, 

 21 

 Holds no fulphur, 210. 

 Smells in the fire like gar- 

 lic, ib. Diffufesitsfmell 

 to a great dlftance. ib. 

 Leaves a black glafs be- 

 hind, ib. 



Wild in mineralogy, what, 



35 

 35 

 35 

 35 

 132 



Wild-pyrites, what, 

 Wild-ftone, what, 

 Wild -waters, what, 

 Wolfram, ivhat, 



*7lnk, what, 187. Effeel 



of, on copper, 187. Forms 



of, ib. How produced, 



188, 192. Origin of, 



190, 292. 



CORRIGEND A. 



PA GE 56. line lajl, read 

 been, 

 p. 80, /. 19, read receptive. 

 f. 136, /. 8, read centner. 

 p. 140, /. 4, read heavy. 

 p. 156, /. 7, read ##. 

 j>. 178,/. 11, read confeclions 

 p. 202, /. 12, read/7. 

 £. 218, /. 6, read illu/lration. 



ib, /. 7. read demonflration. 



p. 220 /. 2. for rites, read 

 pyrites. 



p. 231, /. 9, read ^#. 



p. 234, /. 26, read edulcorate. 



p. 276, /. 9, read preferred. 



p. 349, /. 28, read a dif- 

 ferent, us it. 



FINIS. 



